Wrench.



No. 845,187. PATENTED FEB. 26, 1907.

J. MAOLEAN;

WRENCH.

APPLICATION FILED AUG.24. 1906.

JAMES MACLEAN, OF BOSTON, MASSACHUSETTS.

WRENCH Specification of Letters Patent.

Patented Feb. 26, 1907.

Application filed August 24, 1906. Serial NO. 331,938.

To all whom it may concern:

Be it known that I, JAMES MAOLEAN, a citizen of the United States, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful lmprovement in Wrenches, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to that class of Wrenches that are more particularly appliecl to round rods or pipes, although it may be applied to any use for which the ordinary wrench is suitable, and consists in the peculiar construction and arrangement of parts, which may be best understood by the full rlescription.

. The wrench is illustrated in the accompanying drawings, in which- Figure 1 is an elevation of the wrench as it appears when applieol to a small pipe. Fig. 2 is an elevation showing the wrench as applied to a large pipe. Fig. 3 is a view partly in elevation and partly in vertical section.

The handle and fixed jaw of the wrench is of one piece and is indicated on the cirawin gs by A B. The fined jaw B is nearly in qua-zirant form and has teeth or notches, as shown. A recess R, approximately semicircular in form, is mane in the (See Fig. 8.)

The moving jaw of my wrench is indicated by C D. The parts O and D are maale at right angles to each other and are provided with teeth, as shown. The part D has a cam-shaped piece R, which lies loosely in the recess R. (See Fig. 3.) A yoke-piece K K serves in connection with the pivot-pin E to hold the two jaws of the wrench together loosely.

F is an extension from the part D and serves as a thumb-piece by which the user of the instrument may operate the moving jaw O D of the wrench. A spring H reacts head of the part A B. j

[ against the thumb-piece F and causes the moving jaw to close or to grip onto the obj ject that is being acterl upon. A feature of this wrench is that the part R i is cam-shaped and turns on an eccentric-pin which is in a loose rocking yoke K K. The socket at L furnishes a curved surface for the yoke to rock upon. As the cam part B is l loose in the socket B, (there being a clearance-space, as shown at B it is evident that the moving jaw is quite free in its movements. Thus when open it will when operateol by the spring only loosely grip the pipe or bolt, but as soon as the hanule A is operated upon then the cam eccentric R will draw the jaw C D inward and firmly seize the pipe and hold it with an increasing pressure. To relieve the wrench, it is only necessary to swing the handle A slightly in the reverse direction. This action will at once allow the moving jaw to drop back, and the wrench will be free for another adjustment or to be removecl altogether.

I I claim A wrench comprising a handle, a fixed jaw quaclrant-like in shape and having teeth on its l curved portion, a semicircular socket formed at the rear of the toothetl part of the fixed jaw, a movable jaw provided with teeth j asdescribecl and having a cam-shaped eccen- 1 me constructed to work loosely 1n the said j semicircular socket, a loosely-fitting yoke at- 1 tacheri by an eccentrically-located pivot to the sairi camshape:l eccentric; substantially as and for the purpose set forth.

In testimony whereof I have signecl my name to this specification, in the presence of two subscribing witnesses, on this 17th day of August, A. D. 1906.

JAMES MAOLEAN.

JOHN BUOKLER,

j Witnesses: I j HARRY O. LUcE. 

